A diaphragm compressor follower valve and use method thereof

Abstract

The present invention discloses a diaphragm compressor follower valve and a method for using the same, and belongs to the technical field of diaphragm compressor structure. It includes a valve body and a valve cover that are fixedly connected to each other; a working chamber is formed between the valve body and the valve cover; a valve needle is arranged in the working chamber; the valve body is provided with an oil chamber connecting end; and the oil chamber connecting end is connected with an oil channel, and the oil channel and the valve needle are in detachable sealing contact; the valve cover is provided with an exhaust pressure connecting end; the exhaust pressure connecting end is connected with an air channel, and a piston rod is slidingly arranged in the air channel, and a spring seat is fixedly arranged on the piston rod; a spring is sleeved on the outer side of the valve needle, and the spring is located between the oil stopper and the spring seat. The device adopts a valve needle structure to make the pressure-bearing area small, and the overall size of the follower valve is correspondingly reduced, and the weight is light. In occasions with large vibrations, the burden on the follower valve connector will also be reduced at the same time. The discharge oil pressure is also only related to the compressor exhaust pressure and the pre-compression amount of the spring. The discharge oil pressure can be adjusted by replacing the spring or adding a spring adjustment pad. It is flexible to use and the controllability is greatly enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of diaphragm compressor structures, and in particular to a diaphragm compressor follower valve and a use method thereof. Background Art

[0002] At present, the basic principle of the diaphragm compressor is that the motor drives the crankshaft through the crosshead to make the piston reciprocate. The piston deforms the diaphragm under pressure through the hydraulic oil in the oil chamber, and changes the volume of the air chamber above the diaphragm to achieve gas compression. During the operation of the diaphragm compressor, the piston cannot ensure that the hydraulic oil in the oil chamber does not leak, so it is necessary to add oil to the oil chamber during the suction process of each reciprocating cycle. At the same time, it is also necessary to discharge excess oil when the compression is completed in each reciprocating cycle. The function of the follow-up valve is to discharge excess oil in the oil chamber by adjusting the oil pressure.

[0003] In the prior art, reference Figure 1 The principle of the servo valve is that the upper and lower valve covers sandwich the diaphragm in the middle, the exhaust pressure is introduced into one side of the diaphragm, and the diaphragm cavity oil pressure is introduced into the other side of the diaphragm. When the oil pressure is high enough, the pressure difference on both sides of the diaphragm will cause the diaphragm to deform. After the diaphragm is deformed, the hydraulic oil can be discharged at the oil drain port, thereby realizing the opening of the servo valve. After the oil is discharged, the oil pressure decreases, the diaphragm will rebound, and the oil drain port will be closed, thereby realizing the function of controlling the oil volume. Therefore, the opening pressure of the servo valve changes with the current compressor exhaust pressure, and is usually slightly higher than the exhaust pressure.

[0004] However, the traditional servo valve design will have the following technical problems:

[0005] 1. Large size, heavy weight, difficult to assemble

[0006] The diaphragm in the traditional follow-up valve must have enough deformation to ensure smooth opening, which results in a larger diaphragm diameter, limited follow-up valve size, and correspondingly increased weight, cost, and difficulty in assembly.

[0007] 2. The diaphragm is easily damaged

[0008] Due to the high speed of the compressor, the movement frequency of the diaphragm of the follower valve is also very fast, and the diaphragm is prone to fatigue damage. In addition, the deformation stiffness of the diaphragm is different, and the oil pressure is not easy to control, which increases the difficulty of debugging the follower valve.

[0009] 3. Complex structure and inflexible use

[0010] In order to prevent accidents caused by diaphragm rupture, three diaphragms need to be used and equipped with a rupture alarm device (refer to Figure 1 ), complex structure, high cost and short service life.

[0011] In view of the above-mentioned existing technical conditions, the applicant of the present invention has conducted a lot of repeated and beneficial explorations, and finally achieved effective results in the product, and formed the technical solution to be introduced below. Summary of the invention

[0012] To this end, the present invention provides a diaphragm compressor follow-up valve and a method of using the same to solve the above-mentioned technical problems existing in the follow-up valve in the prior art due to the use of a diaphragm structure.

[0013] In order to achieve the above object, the present invention provides the following technical solutions:

[0014] A diaphragm compressor follower valve comprises a valve body and a valve cover fixedly connected to each other;

[0015] A working chamber is formed between the valve body and the valve cover; a valve needle is provided in the working chamber, and an oil stopper is provided on the outer wall of the valve needle; an oil transfer chamber is formed in the working chamber corresponding to the inner part of the valve body; the oil stopper is slidably arranged in the oil transfer chamber; an oil outlet end is provided on the outer part of the valve body, and the oil outlet end is communicated with the oil transfer chamber;

[0016] The valve body is provided with an oil chamber connection end, and the oil chamber connection end can be connected to the oil chamber of the diaphragm compressor; and the oil chamber connection end is connected to an oil channel, and the oil channel is in detachable sealing contact with the valve needle at one end away from the oil chamber connection end; the oil channel can be connected or disconnected with the oil transfer chamber in a one-to-one correspondence when the valve needle is separated from or sealed from the oil channel;

[0017] The valve cover is provided with an exhaust pressure connection end, and the exhaust pressure connection end can be connected to the exhaust port of an external compressor; and the exhaust pressure connection end is connected to an air channel, and a piston rod is slidably arranged in the air channel, and the piston rod is fixedly provided with a spring seat slidably arranged in the working chamber;

[0018] A spring is sleeved on the outer side of the valve needle, and the spring is located between the oil stopper and the spring seat of the valve needle.

[0019] On the basis of the above technical solution, the present invention can also be improved as follows:

[0020] Furthermore, the valve body is screwed with a first mounting seat at one end away from the valve cover;

[0021] The oil chamber connection end is opened at an end of the first mounting seat away from the valve cover;

[0022] The oil passage is located inside the first mounting seat.

[0023] Furthermore, the first mounting seat has a sealing cone surface at one end corresponding to the oil passage and away from the oil chamber connection end;

[0024] The outer edge of the valve needle contacts the inner side wall of the sealing cone surface.

[0025] Furthermore, the cross-sectional area of ​​the piston rod is the same as the equivalent contact area between the valve needle and the first mounting seat.

[0026] Furthermore, the valve cover is screwed with a second mounting seat at one end away from the valve body;

[0027] The exhaust pressure connection end is disposed at an end of the second mounting seat away from the valve body;

[0028] The air passage is located inside the second mounting seat.

[0029] Furthermore, the spring seat is provided with a slideway corresponding to the valve needle, and the valve needle is slidably arranged in the slideway;

[0030] An adaptive cavity is provided between the valve needle and the bottom end of the slideway.

[0031] The method of using the diaphragm compressor follower valve comprises the following steps:

[0032] S1: Connect the oil chamber connection end to the oil chamber of the diaphragm compressor; connect the exhaust pressure connection end to the exhaust port of the external compressor;

[0033] S2: The gas entering through the exhaust pressure connection end pushes the piston rod to drive the spring seat to move under its own pressure. The spring seat compresses the spring during the movement, and the spring transmits the force to the valve needle through the oil stopper;

[0034] S3: The oil entering through the connecting end of the oil chamber passes through the oil channel and uses its oil pressure to act on the valve needle. After the oil pressure overcomes the air pressure and the initial elastic force of the spring, the passage between the oil channel and the oil transfer chamber is connected, that is, the follow-up valve is opened; as the oil pressure decreases, the valve needle returns to its position under the push of the air pressure and the spring, so that the passage between the oil channel and the oil transfer chamber is cut off, that is, the follow-up valve is closed.

[0035] The present invention has the following advantages:

[0036] 1. The traditional follow-up valve structure requires a large pre-tightening force around the diaphragm to ensure sealing, which requires the configuration of corresponding large-size bolts, and the valve cover and valve body will also be designed to be very thick and heavy due to the large diaphragm. The follow-up valve structure in this solution has a small pressure-bearing area, a correspondingly reduced overall size, and a light weight. In occasions with large vibrations, the burden on the follow-up valve connector will also be reduced at the same time.

[0037] 2. The diaphragm used in the traditional follow-up valve structure is thin, has large deformation, and has poor ability to withstand fatigue loads. It is necessary to design an additional rupture alarm structure, and the workload of replacing the diaphragm is large and the assembly requirements are high. After using the spring structure, the service life is greatly extended, and the overall structure is simple and easy to disassemble and assemble.

[0038] 3. The discharge pressure of the traditional servo valve is related to many factors such as exhaust pressure, diaphragm stiffness, diaphragm thickness, assembly status, processing quality, etc. It is difficult to accurately control and difficult to meet the needs of the servo valve under various working conditions. The discharge pressure of the servo valve structure in this solution is only related to the compressor exhaust pressure and the spring pre-compression. The discharge pressure can be adjusted by replacing the spring or adding a spring adjustment pad. It is flexible to use, and the controllability is greatly enhanced, which improves the functional practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the implementation mode of the present invention or the technical solution in the prior art, the drawings required for the implementation mode or the description of the prior art will be briefly introduced below. The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0040] Figure 1 It is a structural schematic diagram of a servo valve provided in the prior art;

[0041] Figure 2 A schematic structural diagram of a spool valve provided in an embodiment of the present invention.

[0042] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0043] Valve body 1, working chamber 11, oil transfer chamber 12, valve cover 2, first mounting seat 3, oil chamber connecting end 31, oil channel 32, sealing cone surface 33, second mounting seat 4, exhaust pressure connecting end 41, air channel 42, spring seat 5, piston rod 51, valve needle 6, oil stopper 61, adaptive chamber 62, spring 7, oil outlet end 8.

[0044] Diaphragm 9, exhaust pressure connection end 91, oil cavity connection end 92, oil discharge port 921, rupture alarm port 93. DETAILED DESCRIPTION

[0045] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] The terms such as "upper", "lower", "left", "right", and "middle" used in this specification are only for the convenience of description and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships should be regarded as within the scope of the invention without substantially changing the technical content.

[0047] like Figure 2 As shown, an embodiment of the present invention provides a diaphragm compressor follower valve, including a valve body 1, a valve cover 2, a first mounting seat 3, an oil chamber connecting end 31, a second mounting seat 4, an exhaust pressure connecting end 41, a piston rod 51, and a valve needle 6 and a spring 7 arranged in coordination, so as to realize that the air pressure pushes the piston rod 51 to change the compression amount of the spring 7 to flexibly control the opening of the follower valve through the combination of the valve needle 6 and the spring 7. In addition, since the valve needle 6 structure is adopted to make the pressure-bearing area small, the overall size of the follower valve is correspondingly reduced, and the weight is light. In occasions with large vibrations, the burden on the follower valve connector will also be reduced at the same time. At the same time, the discharge oil pressure is only related to the compressor exhaust pressure and the pre-compression amount of the spring 7. The discharge oil pressure can be adjusted by replacing the spring 7 or adding a spring adjustment pad. It is flexible to use and the controllability is greatly enhanced. After using the spring 7 structure, the service life can be greatly extended, and the overall structure is simple and easy to disassemble and assemble. The specific settings are as follows:

[0048] The valve body 1 and the valve cover 2 are screwed and fixedly connected to form a working chamber 11 between the valve body 1 and the valve cover 2; the valve needle 6 is arranged in the working chamber 11, and the outer wall of the valve needle 6 is provided with an oil stopper 61; the working chamber 11 forms an oil transfer chamber 12 inside the corresponding valve body 1; the oil stopper 61 is slidably arranged in the oil transfer chamber 12; the outside of the valve body 1 is provided with an oil outlet port 8, and the oil outlet port 8 is connected to the oil transfer chamber 12.

[0049] A first mounting seat 3 is screwed to the end of the valve body 1 away from the valve cover 2. The first mounting seat 3 is provided with an oil chamber connecting end 31 at the end away from the valve cover 2 for connecting with the oil chamber of the diaphragm compressor through the oil chamber connecting end 31. An oil channel 32 connected with the oil chamber connecting end 31 is provided in the first mounting seat 3. The oil channel 32 is in contact with the valve needle 6 at the end away from the oil chamber connecting end 31. The oil channel 32 can be connected with or disconnected from the oil transfer chamber 12 under the action of the valve needle 6.

[0050] The valve cover 2 is screwed with a second mounting seat 4 at one end away from the valve body 1. The second mounting seat 4 is provided with an exhaust pressure connection end 41 at one end away from the valve body 1, so as to be connected with the exhaust port of the compressor through the exhaust pressure connection end 41. The second mounting seat 4 is provided with an air passage 42 in communication with the exhaust pressure connection end 41.

[0051] A spring seat 5 is slidably provided in the working chamber 11 at the corresponding valve cover 2 part, and a piston rod 51 is integrally provided at one side end of the spring seat 5; the piston rod 51 is stably slidably provided in the air passage 42, so that when a predetermined exhaust pressure is introduced into the exhaust pressure connection end 41, the air pressure can push the piston rod 51 to slide toward the valve body 1 in the air passage 42, and at the same time, the spring seat 5 can slide toward the valve body 1 in the working chamber 11.

[0052] The spring 7 is sleeved on the outside of the valve needle 6, and the spring 7 is located between the oil stopper 61 of the valve needle 6 and the spring seat 5, so as to utilize the spring 7 to transmit the pressure from the piston rod 51 and the spring seat 5, and transmit the force to the oil stopper 61 of the valve needle 6 through the other end of the spring 7. The oil stopper 61 can drive the valve needle 6 to further apply force to the outlet of the oil channel 32 of the first mounting seat 3; and under the effect of the self-prestress of the spring 7 when it is not subjected to the force of the spring seat 5, the valve needle 6 can fit more closely with the outlet of the oil channel 32.

[0053] Specifically, a slideway is provided at the other side end of the spring seat 5 corresponding to the valve needle 6, and the valve needle 6 is slidably arranged in the slideway, and an adaptive cavity 62 is reserved between the valve needle 6 and the bottom end of the slideway, so that when oil and gas are introduced, the size of the adaptive cavity 62, that is, the relative position between the valve needle 6 and the spring seat 5, can be automatically adjusted with the oil pressure. Under the action of gas pressure, the piston rod 51 is pushed to carry the spring seat 5 toward the first mounting seat 3. The spring seat 5 will compress the spring 7 during the movement to increase the pre-compression of the spring 7. The amount of air pressure and the spring 7 increase the pre-pressure of the valve needle 6 on the first mounting seat 3; when the oil chamber pressure gradually increases, the oil pressure will overcome the pre-pressure of the valve needle 6 on the first mounting seat 3, and push the valve needle 6 to move toward the side of the spring seat 5, so that the oil channel 32 is connected with the oil transfer chamber 12, that is, the follow-up valve is opened; when the oil pressure decreases, the valve needle 6 will contact the first mounting seat 3 again under the joint push of the air pressure and the spring 7, so that the oil channel 32 and the oil transfer chamber 12 are quickly cut off, that is, the follow-up valve is quickly closed to prevent excessive oil discharge.

[0054] As a preferred solution of this embodiment, the first mounting seat 3 has a sealing cone surface 33 at one end of the oil passage 32 away from the oil chamber connection end 31, and the outer edge of the valve needle 6 contacts the inner wall of the sealing cone surface 33 to effectively increase the sealing performance between the two; and the cross-sectional area of ​​the piston rod 51 is the same as the equivalent contact area between the valve needle 6 and the first mounting seat 3, so that when the oil pressure and the air pressure are the same, the pressure generated by the oil pressure on the valve needle 6 and the air pressure on the piston rod 51 are also the same. In this way, the pressure difference between the oil pressure and the air pressure when the follower valve is opened can be set by setting the pre-compression amount of the spring 7.

[0055] The method for using the diaphragm compressor follower valve comprises the following steps:

[0056] S1: connect the oil chamber connection end 31 of the first mounting seat 3 to the oil chamber of the diaphragm compressor; connect the exhaust pressure connection end 41 of the second mounting seat 4 to the exhaust port of the compressor.

[0057] S2: The gas entering through the exhaust pressure connection end 41 pushes the piston rod 51 to drive the spring seat 5 to move under its own pressure. The spring seat 5 compresses the spring 7 during the movement. The spring 7 generates the same rebound force after being compressed, and the spring 7 transmits the force to the valve needle 6 through the oil stopper 61;

[0058] S3: The oil entering through the oil chamber connection end 31 reaches the sealing cone surface 33 through the oil passage 32, and uses the oil pressure it has to act on the valve needle 6. After the oil pressure overcomes the air pressure and the initial elastic force of the spring 7, the valve needle 6 is separated from the first mounting seat 3, so that the passage between the oil passage 32 and the oil transfer chamber 12 is connected, that is, the follower valve is opened;

[0059] As the oil pressure decreases, the valve needle 6 will contact the first mounting seat 3 again under the push of the air pressure and the spring 7, so that the passage between the oil channel 32 and the oil transfer chamber 12 is cut off, that is, the follower valve is closed.

[0060] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A diaphragm compressor follower valve, Features: It includes a valve body and a valve cover which are fixedly connected to each other; A working chamber is formed between the valve body and the valve cover; a valve needle is provided in the working chamber, and an oil stopper is provided on the outer wall of the valve needle; an oil transfer chamber is formed in the working chamber corresponding to the inner part of the valve body; the oil stopper is slidably arranged in the oil transfer chamber; an oil outlet end is provided on the outer part of the valve body, and the oil outlet end is communicated with the oil transfer chamber; The valve body is provided with an oil chamber connection end, and the oil chamber connection end can be connected to the oil chamber of the diaphragm compressor; and the oil chamber connection end is connected to an oil channel, and the oil channel is in detachable sealing contact with the valve needle at one end away from the oil chamber connection end; the oil channel can be connected or disconnected with the oil transfer chamber in a one-to-one correspondence when the valve needle is separated from or sealed from the oil channel; The valve cover is provided with an exhaust pressure connection end, and the exhaust pressure connection end can be connected to the exhaust port of an external compressor; and the exhaust pressure connection end is connected to an air channel, and a piston rod is slidably arranged in the air channel, and the piston rod is fixedly provided with a spring seat slidably arranged in the working chamber; A spring is provided on the outer sleeve of the valve needle, and the spring is located between the oil stopper and the spring seat of the valve needle; The valve body is threadedly connected with a first mounting seat at one end away from the valve cover; The oil chamber connection end is opened at an end of the first mounting seat away from the valve cover; The oil passage is located inside the first mounting seat; The valve cover is screwed with a second mounting seat at one end away from the valve body; The exhaust pressure connection end is disposed at an end of the second mounting seat away from the valve body; The air passage is located inside the second mounting seat.

2. A diaphragm compressor follower valve according to claim 1, Its characteristics are: The first mounting seat has a sealing cone surface at one end thereof corresponding to the oil passage away from the oil chamber connection end; The outer edge of the valve needle contacts the inner side wall of the sealing cone surface.

3. A diaphragm compressor follower valve according to claim 2, Its characteristics are: The cross-sectional area of ​​the piston rod is the same as the equivalent contact area between the valve needle and the first mounting seat.

4. A diaphragm compressor follower valve according to claim 1, Its characteristics are: The spring seat is provided with a slideway corresponding to the valve needle, and the valve needle is slidably arranged in the slideway; An adaptive cavity is provided between the valve needle and the bottom end of the slideway.

5. A method for using the diaphragm compressor follower valve according to any one of claims 1 to 4, It is characterized in that The following steps are involved: S1: Connect the oil chamber connection end to the oil chamber of the diaphragm compressor; connect the exhaust pressure connection end to the exhaust port of the external compressor; S2: The gas entering through the exhaust pressure connection end pushes the piston rod to drive the spring seat to move under its own pressure. The spring seat compresses the spring during the movement, and the spring transmits the force to the valve needle through the oil stopper; S3: The oil entering through the connecting end of the oil chamber passes through the oil channel and uses its oil pressure to act on the valve needle. After the oil pressure overcomes the air pressure and the initial elastic force of the spring, the passage between the oil channel and the oil transfer chamber is connected, that is, the follow-up valve is opened; as the oil pressure decreases, the valve needle returns to its position under the push of the air pressure and the spring, so that the passage between the oil channel and the oil transfer chamber is cut off, that is, the follow-up valve is closed.

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